US5909308A - Achromatic and athermalized reimager - Google Patents
Achromatic and athermalized reimager Download PDFInfo
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- US5909308A US5909308A US08/780,295 US78029597A US5909308A US 5909308 A US5909308 A US 5909308A US 78029597 A US78029597 A US 78029597A US 5909308 A US5909308 A US 5909308A
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- reimager
- achrathermalized
- lenses
- front objective
- planar
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- 239000000463 material Substances 0.000 claims abstract description 16
- 239000005387 chalcogenide glass Substances 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract 5
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims abstract 4
- 239000011521 glass Substances 0.000 claims description 13
- 210000001747 pupil Anatomy 0.000 claims description 13
- 229910052732 germanium Inorganic materials 0.000 claims description 7
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims 3
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 30
- 239000005083 Zinc sulfide Substances 0.000 description 14
- 229910052984 zinc sulfide Inorganic materials 0.000 description 14
- 238000012546 transfer Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0875—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/33—Transforming infrared radiation
Definitions
- the invention relates to an achrathermalized reimager, that is, an achromatic and athermalized lens system comprising a front objective, an intermediate image plane of a relay optic and especially a relay optic as utilized in the infrared range of about 10 ⁇ m as an optic for thermal image apparatus.
- a reimager of this kind is disclosed in U.S. Pat. No. 4,679,891.
- the lenses are made of chalcogenide glass, zinc selenide (ZnSe), zinc sulfide (ZnS) and germanium (Ge).
- the front objective must have at least three lenses made of different materials which lie close one next to the other. In all examples, at least six lenses are arranged forward of the exit pupil.
- achromatic and athermalized are expressed as the acronym “achrathermalized”. Accordingly, the achromatic and athermalized reimager is referred to hereinafter as the achrathermalized reimager.
- the achrathermalized reimager of the invention includes a front objective and a relay optic.
- the front objective comprises only two lenses made of two materials, namely, a negative lens made of ZnSe or ZnS and a positive lens made of chalcogenide glass.
- the chalcogenide glass is especially type IG6 or IG4 made by Vitron Spezialwerkstoffe GmbH of Jena, Germany.
- the front objective is itself achrathermalized.
- Another embodiment of the reimager of the invention is a telescope having an intermediate image with the telescope including four or five lenses for forming the image.
- This telescope is for the mean infrared wavelengths and especially for wavelengths in the range of 7.5 ⁇ m to 10.5 ⁇ m.
- the four or five lenses are achromatically better than 80% and are preferably better than 65% of the depth of field and athermally the lenses lie in a temperature range about the normal temperature such as would be expected in the field. This temperature can be -40° C. to +70° C. and the change in image distance is less than 60% of the depth of field.
- Another embodiment of the reimager of the invention includes a positive lens and a negative lens each for the front objective and the relay optic with the negative lens being made of ZnSe or ZnS in each case.
- the above three embodiments are exemplary of those wherein the number of lenses of an achrathermalized reimager of high quality is drastically reduced.
- the invention proceeds from the recognition that both component systems (front objective and relay optic) must be independently achromatic and athermalized because otherwise the chromatic variations of image position and image size cannot be corrected simultaneously and the position of the intermediate image varies.
- This table shows how well different materials are adapted to each other.
- the chalcogenide glasses IG4 and IG6 are suitable as positive lenses in a combination with a negative lens made of ZnSe.
- ZnS is suitable as a partner in the negative lens especially when achromatics are considered because the individual refractive forces can be held low because of the extreme difference in the dispersion.
- the relay optic comprises at most three lenses, more specifically, a negative lens made of ZnS or ZnSe and a positive lens made of the same chalcogenide glass which is already used in the front objective.
- An especially advantageous embodiment of the invention is provided when the front objective and the relay optic are configured to be both achromatic and athermalized.
- a uniform distribution of the refractive forces is provided.
- no lens has more than 2.2 times the refractive power of the total system.
- one or two aspheric lens surfaces are provided of which one is in the front objective.
- the aspherical data for this power-series development is provided in the tables.
- all positive lenses are made of chalcogenide glass such as is the case in the embodiments shown and because of the characteristics shown in Table 1.
- infrared detector units are adapted by providing a planar-parallel plate between the last two lenses and the exit pupil. These infrared detector units are available arranged linearly as in Examples 1 to 7 (infra) or as two-dimensional arrays as presented in Examples 8 to 10 (infra).
- a narciss diaphragm is provided in the intermediate image plane. This diaphragm prevents, to a significant extent, that infrared radiation of the IR detector reaches the IR detector via reflection on a lens surface.
- the narciss diaphragm in the intermediate image plane also functions to adapt to the detector. Accordingly, disturbing back reflections of the IR radiation emanating from the detector are thereby avoided as far as possible.
- tolerances of ⁇ 0.5% focal length variation over a temperature range of -40° C. to +70° C. as well as wavelengths of 7.5 ⁇ m to 10.5 ⁇ m are provided, more specifically, the maximum focal intercept difference within the diffraction-limiting depth of field of ⁇ 40 ⁇ m.
- This difference or displacement is presented in Table 11 and is the difference between the real focal intercept caused by temperature and wavelength and the desired focal intercept for nominal or reference conditions. Characterizing the lens system of the invention as achrathermalized is therefore appropriate.
- the lenses of the front objective are made of only two different materials. In the front objective or in the entire reimager, only two lens materials are satisfactory.
- the material of the detector entry window does not belong thereto. At least one material less is needed compared to the reimager disclosed in U.S. Pat. No. 4,679,891.
- a plane-parallel plate is mounted behind the front objective and can be tilted.
- a two-dimensional raster detector array is mounted in the image plane and tilting the plane-parallel plate effects an offset of the image and thus makes possible the "interlace" method for an increase in resolution.
- FIG. 1 is a section view of a first embodiment of the reimager of the invention wherein the reimager includes five lenses;
- FIG. 2 shows the diffraction modulation transfer function and the contrast as a function of the defocusing for different image heights
- FIGS. 3 to 8 are lens section views of the four lenses in accordance with Examples 2 to 7, respectively;
- FIG. 9 shows the diffraction modulation transfer function and the contrast as a function of the defocusing for different ray elevations for Example 7;
- FIGS. 10 to 12 show lens section views for the three embodiments of Examples 8 to 10, respectively, which are provided for a two-dimensional IR detector in accordance with the HDTV standard;
- FIG. 13 shows the diffraction modulation transfer function (both tangentially and radially) for different ray elevations in Example 10.
- the five-lens achrathermalized reimager shown in FIG. 1 corresponds to Example 1 in Table 12.
- This reimager comprises a front objective 101 and a relay optic 102 which can also be characterized as an ocular.
- An IR line detector 20 is mounted in the image plane 15.
- the IR line detector is cooled and is seated in a Dewar vessel 21 for isolation.
- the Dewar vessel 21 has a window made of germanium which has two plane-parallel surfaces (12, 13).
- a cooled aperture diaphragm (cold shield) is mounted in the exit pupil 14.
- a narciss diaphragm is mounted in the intermediate image plane 5.
- the exit pupil 14 is at a distance forward of the intermediate image plane 15 of 4 to 8 times half of the image diagonal.
- the half diagonal of the image is identified by reference numeral 50 in FIG. 1.
- the half diagonal is the image field radius.
- the image diagonal would be the diagonal of the rectangular image.
- the section view presented in FIG. 1 is along an image diagonal.
- the front objective includes a negative meniscus lens made of ZnSe having the surfaces 1 and 2 with the rear surface 2 being aspheric and a positive lens made of the chalcogenide glass IG6 made by Vitron, Jena, Germany having surfaces 3 and 4.
- the relay optic includes a negative meniscus lens made of ZnSe, a positive lens of IG6 and a weakly positive germanium lens having an aspheric front surface 10 and the rear surface 11.
- Table 1 provides the radii and spacings and additional data.
- FIG. 2 shows the diffraction modulation transfer function obtained with the embodiment shown in FIG. 1.
- FIG. 2 also shows the contrast as a function of defocusing for various ray heights.
- the additional embodiments require only four lenses having two aspherical surfaces.
- FIG. 3 is a lens section view of the second embodiment of the invention and Table 2 provides data therefor.
- the germanium plane-parallel plate (210, 211), the exit pupil 212 and the image plane 213 correspond to the data shown in FIG. 1.
- three materials are used, namely: ZnS, ZnSe and IG6.
- FIG. 4 is a lens section view of the third embodiment and data therefor is provided in Table 3.
- Table 3 Here, only ZnSe and IG6 are used.
- the surface 308 is aspheric which, however, is not as easily manufactured from IG6 glass as is the case for ZnSe or ZnS.
- FIG. 5 is a lens section view for the fourth example and data is presented therefor in Table 4.
- FIG. 6 shows a fifth embodiment and the data therefor is presented in Table 5.
- FIG. 7 shows a sixth embodiment and the data therefor is presented in Table 6.
- FIG. 8 shows a seventh embodiment and the data therefor is presented in Table 7.
- FIG. 9 is a view which corresponds to FIG. 2 and shows the modulation transfer function and the contrast as a function of defocusing for different ray elevations YB at a spatial frequency of 20 lines/mm.
- a diffraction limited correction is present almost to the edge of the image.
- More lenses are however also not needed when the configuration is for a two-dimensional detector array in accordance with HDTV standards.
- the following examples are configured for this purpose.
- the eighth embodiment of FIG. 10 has the data of Table 8.
- Reference numeral 1000 identifies the entry pupil.
- the deflecting mirror 1008 only serves to adapt to the geometry needed to accommodate the embodiment in a specific location.
- the deflecting mirror can otherwise be dispensed with.
- a similar mirror can be included in Examples 1 to 7 as may be required.
- the detector 1020 is accommodated in the image plane 1016.
- the detector 1020 must be cooled and it is therefore mounted in a Dewar vessel 1021.
- the Dewar vessel 1021 includes a Ge entry window (1013, 1014) and the diaphragm 1015 in the exit pupil of the objective.
- a ZnSe plane-parallel plate (1005, 1006) is mounted rearward of the front objective (1001 to 1004) in order to increase the image resolution in accordance with the interlace method.
- the plane-parallel plate (1005, 1006) can be tilted by the drive 1050 so that the image in the image plane 1016 is laterally displaced approximately by half the pixel size (half the raster dimension of the detector array 1020). This part too can be omitted; however, the correction of the reimager must then be adapted.
- the ninth example of FIG. 11 has the data listed in Table 9 and, as the first embodiment, has a total of five lenses of which three are in the ocular.
- This embodiment is advantageous with respect to manufacture in that the aspheric surfaces 1103 and 1113 need not be machined into the chalcogenide glass IG6.
- the second aspheric surface 1109 is on IG6 glass and is applied in a manner similar to the next embodiment.
- the tenth example of FIG. 12 has the data presented in Table 10 and includes four lenses.
- the embodiment of FIG. 12 substantially corresponds to the embodiment of FIG. 8 but is configured to have a shorter structural length.
- the length from the entry pupil (1000 or 1200) up to the image plane (1016 or 1216) is 210 mm in the Example 8 and is here only 200 mm for Example 10.
- a further reduction in structural length would mean a significant tightening of the system and would mean very tight manufacturing tolerances.
- FIG. 11 is still somewhat shorter (195 mm) and can be shortened further but has one lens more and has the additional manufacturing complexity associated therewith.
- FIG. 13 shows the diffraction modulation transfer function for the tenth Example.
- the modulation loss is stable and low for a complete image angle.
- the chromatic length deviation is provided as a listing in Table 12 as the position difference of the best adjusting plane ⁇ BEE for the wavelengths 8 ⁇ m and 10.5 ⁇ m referred to a base wavelength of 9 ⁇ m.
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- Optics & Photonics (AREA)
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- Eyeglasses (AREA)
Abstract
Description
ν.sub.1 * τ.sub.1 =ν.sub.2 *τ.sub.2
τ=(1+dn/dT)/(1+α)-1≈dn/dT-α(for α<<1)
______________________________________ Material ν dn/dT*10.sup.6 α*10.sup.6 τ*10.sup.6 ν*τ*10.sup.3 ______________________________________ Ge 886 400 5.7 394 349 ZnSe 87 60 7.6 52 4.5 ZnS 35 43 7.8 35 1.2 IG4 262 36 20.4 16 4.2 IG6 228 41 20.7 20 4.6 ______________________________________
TABLE 1 ______________________________________ f' = 15 mm No. Radius Thickness Glass ______________________________________ 1 46.9760 10.000 2 25.0866 Asphere 2.500 ZnSe 3 21.9090 .500 4 86.5960 5.200 IG6 5 Planar 25.902 6 -5.5430 15.823 7 -9.3057 2.300ZnSe 8 26.7990 .573 9 -33.7380 3.500IG6 10 47.3241 Asphere .300 11 101.4500 1.900Ge 12 Planar 2.250 13 Planar 1.000Ge 14 Planar 2.000 15 Planar 8.750 ______________________________________ Aspheres:Surface 2 Constants: Apex radius (y) = 25.08658 K (y) = .002340 Expansion Constants: .8058753E-05 .3657305E-08 .2752318E-09 .0000000E+00Surface 10 Constants: Apex radius (y) = 47.32405 K (y) = -.0440660 Expansion Constants: -.6614489E-04 .1768410E-06 -.7598492E-08 .0000000E+00 ______________________________________
TABLE 2 ______________________________________ NO. Radius Thickness Glass ______________________________________ 201 22.0670 52.900 202 60.8660 3.600 IG6 203 -77.9635 Asphere 4.500 204 100.0000 2.500ZnSe 205 Planar 18.750 206 13.0900 Asphere 28.290 207 10.5930 2.000ZnS 208 12.1440 .600 209 58.7150 2.900IG6 210 Planar 2.200 211 Planar 1.000Ge 212 Planar 2.000 213 Planar 8.750 ______________________________________ Aspheres: -Surface 203 Constants: Apex radius(y) = -77.96350 K(y) = -1.000 Expansion Constants: -.72619900E-05 .6800200E-07 .0000000E+00 .0000000E+00Surface 206 Constants: Apex radius(y) = 13.0900 K(y) = -1.000 Expansion Constants: -.3150800E-06 .1383800E-06 .0000000E+00 .0000000E+00 ______________________________________
TABLE 3 ______________________________________ No. Radius Thickness Glass ______________________________________ 301 42.2927 Asphere 63.439 302 22.6631 3.000ZnSe 303 25.5188 1.000 304 647.0557 4.800IG6 305 Planar 23.811 306 -6.1262 11.300 307 -21.3669 5.000ZnSe 308 17.0686 Asphere .200 309 -17.3063 3.400IG6 310 Planar .800 311 Planar 1.000Ge 312 Planar 2.000 313 Planar 8.750 ______________________________________ Aspheres:Surface 301 Constants: Apex radius (y) = 42.29266 K (y) = -1.000000 Expansion Constants: -.1582073E-05 -.4896612E-08 .0000000E+00 .0000000E+00Surface 308 Constants: Apex radius (y) = 17.06862 K (y) = -1.000000 Expansion Constants: -.3475706E-03 .2280306E-05 .4484519E-07 -.1462254E-08 ______________________________________
TABLE 4 ______________________________________ No. Radius Thickness Glass ______________________________________ 401 -599.0998 Asphere 44.718 402 87.4600 3.000ZnSe 403 53.5957 1.000 404 -87.8005 4.800IG6 405 Planar 27.982 406 24.4608 24.850 407 13.1356 5.000ZnSe 408 10.8944 Asphere .200 409 -1271.9981 3.400IG6 410 Planar .800 411 Planar 1.000Ge 412 Planar 2.000 413 Planar 8.750 ______________________________________ Aspheres:Surface 401 Constants: Apex radius (y) = -599.09977 K (y) = -1.000000 Expansion Constants: -.8428285E-05 -.3956574E-08 .0000000E+00 .0000000E+00Surface 408 Constants: Apex radius (y) = 10.89437 K (y) = -1.000000 Expansion Constants: -.5138828E-05 -.7401475E-07 .0000000E+00 .0000000E+00 ______________________________________
TABLE 5 ______________________________________ No. Radius Thickness Glass ______________________________________ 501 44.1079 49.220 502 -132.0159 4.800 IG6 503 -64.8929 1.000 504 -670.0914 Asphere 3.000ZnSe 505 Planar 23.480 506 25.2586 24.850 507 14.0250 5.000ZnSe 508 11.0332 Asphere .200 509 983.9787 3.400IG6 510 Planar .800 511 Planar 1.000Ge 512 Planar 2.000 513 Planar 8.750 ______________________________________ Aspheres:Surface 504 Constants: Apex radius (y) = -670.09141 K (y) = -1.000000 Expansion Constants: .4782106E-05 -.1625202E-07 .0000000E+00 .0000000E+00Surface 508 Constants: Apex radius (y) = 11.03324 K (y) = -1.000000 Expansion Constants: -.1089224E-04 .0000000E+00 .0000000E+00 .0000000E+00 ______________________________________
TABLE 6 ______________________________________ No. Radius Thickness Glass ______________________________________ 601 21.7506 53.979 602 65.1818 4.800 IG6 603 -111.3462 1.500 604 79.7375 Asphere 3.000ZnSe 605 Planar 19.721 606 51.1790 23.350 607 23.6351 5.000ZnSe 608 11.0598 Asphere .200 609 133.8056 3.400IG6 610 Planar .800 611 Planar 1.000Ge 612 Planar 2.000 613 Planar 8.750 ______________________________________ Aspheres:Surface 604 Constants: Apex radius (y) = 79.73745 K (y) = -1.000000 Expansion Constants: .39594870E-05 -.5457340E-07 .0000000E+00 .0000000E+00Surface 608 Constants: Apex radius (y) = 11.05978 K (y) = -1.000000 Expansion Constants: -.2577051E-04 .0000000E+00 .0000000E+00 .0000000E+00 ______________________________________
TABLE 7 ______________________________________ No. Radius Thickness Glass ______________________________________ 701 21.3815 52.856 702 49.8447 3.600IG6 703 800.0000 Asphere 1.000 704 61.5954 2.500ZnSe 705 Planar 22.544 706 13.8307 Asphere 26.750 707 11.0599 2.200ZnS 708 11.1423 .300 709 52.5847 3.000IG6 710 Planar 1.000 711 Planar 1.000Ge 712 Planar 2.000 713 Planar 8.750 ______________________________________ Aspheres:Surface 703 Constants: Apex radius (y) = 800.0000 K (y) = -1.000000 Expansion Constants: -7141412E-05 .2451556E-07 .0000000E+00 .0000000E+00Surface 706 Constants: Apex radius (y) = 13.8307 K (y) = -1.000000 Expansion Constants: -.2700965E-04 -.2305985E-06 .0000000E+00 .0000000E+00 ______________________________________
TABLE 8 ______________________________________ NO. Radius Thickness Glass ______________________________________ 1001 28.7553 43.145 1002 69.8042 9.406IG6 1003 35.6669 Asphere .200 1004 14.1804 9.427ZnSe 1005 Planar 9.538 1006 Planar 2.400 1007 Planar 11.000 1008 Planar 25.000 1009 58.9472 Asphere 29.512 1010 -139.1986 12.103 IG6 1011 -92.5450 1.720 1012 -164.2894 7.500 ZnS 1013 Planar 16.000 1014 Planar 3.000Ge 1015 Planar 10.870 1016 Planar 19.180 ______________________________________ Aspheres: -Surface 1003 Constants: Apex radius(y) = 35.66689 K(y) = -1.00000 Expansion Constants: -.4340770E-05 -.7385080E-08 .4664680E+ 11 .0000000E+00Surface 1009 Constants: Apex radius(y) = 58.94719 K(y) = -1.000000 Expansion Constants: -.138106E-05 .375062E-09 ______________________________________
TABLE 9 ______________________________________ No. Radius Thickness Glass ______________________________________ 1101 28.2915 31.600 1102 58.6324 7.742IG6 1103 34.9668 Asphere .200 1104 16.1384 9.157ZnSe 1105 Planar 11.909 1106 Planar 2.400ZnSe 1107 Planar 11.000 1108 Planar 25.000 1109 574.8175 29.056 1110 89.6436 8.358IG6 1111 35.3622 .200 1112 52.0841 7.877 IG6 1113 -68.7404 Asphere 6.688 1114 -245.3063 7.500 ZnS 1115 Planar 3.263 1116 Planar 3.000Ge 1117 Planar 13.187 1118 Planar 16.863 ______________________________________ Aspheres:Surface 1103 Constants: Apex radius (y) = 34.96675 K (y) = -1.000000 Expansion Constants: -.2695330E-05 -.3936930E-08 .0000000E+00 .0000000E+00Surface 1113 Constants: Apex radius (y) = 68.74035 K (y) = -1.000000 Expansion Constants: .474055E-05 -.278672E-08 ______________________________________
TABLE 10 ______________________________________ No. Radius Thickness Glass ______________________________________ 1201 27.3651 38.379 1202 67.4190 9.798IG6 1203 34.0009 Asphere .200 1204 13.5531 8.440ZnSe 1205 Planar 7.946 1206 Planar 2.400ZnSe 1207 Planar 11.000 1208 Planar 25.000 1209 60.0748 Asphere 25.705 1210 -118.4977 12.361 IG6 1211 -82.1878 1.721 1212 -137.3286 7.500 ZnS 1213 Planar 16.500 1214 Planar 3.000Ge 1215 Planar 10.304 1216 Planar 19.746 .000 ______________________________________ Aspheres:Surface 1203 Constants: Apex radius (y) = 34.00089 K (y) = -1.000000 Expansion Constants: -.6158900E-05 -.1050430E-07 .8665520E+00 .0000000E+00Surface 1209 Constants: Apex radius (y) = 60.07483 K (y) = -1.000000 Expansion Constants: -.165072E-05 .47796E-09 ______________________________________
TABLE 11 ______________________________________ Example Δs' Δf' Δ1' ______________________________________ 8 ±0.00 mm +0.15% +9μ 9 ±0.00 mm +0.16% +9μ 10 -0.02 mm +0.07% +4μ ______________________________________
TABLE 12 ______________________________________ Example ΔBEE.sub.8μ ΔBEE.sub.10.5μ ______________________________________ 1 -25μ +30μ 2 ≈0 +10μ 3 -15μ +25μ 4 -15μ +15μ 5 -25μ +15μ 6 -25μ +25μ 7 ≈0 ≈0 8 -30μ ≈ 0 9 -20μ -20μ 10 -30μ ≈ 0 ______________________________________
Claims (23)
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Application Number | Priority Date | Filing Date | Title |
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DE19600336A DE19600336A1 (en) | 1996-01-08 | 1996-01-08 | Achrathermer Reimager |
DE19600336 | 1996-01-08 |
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US5909308A true US5909308A (en) | 1999-06-01 |
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US08/780,295 Expired - Fee Related US5909308A (en) | 1996-01-08 | 1997-01-08 | Achromatic and athermalized reimager |
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EP (1) | EP0783121B1 (en) |
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US20040212877A1 (en) * | 2003-04-25 | 2004-10-28 | Borchard Joseph F. | Monolithic lens/reflector optical component |
US6865318B1 (en) | 2000-02-23 | 2005-03-08 | Schott Glass Technologies, Inc. | Athermal optical components |
US20050128308A1 (en) * | 2003-12-06 | 2005-06-16 | Tholl Hans D. | Imaging device for the stabilized imaging of an object onto a detector |
US20050159542A1 (en) * | 2004-01-17 | 2005-07-21 | General Electric Company | Compositions useful as coatings, their preparation, and articles made therefrom |
GB2420632A (en) * | 2004-11-26 | 2006-05-31 | Diehl Bgt Defence Gmbh & Co Kg | Wide angle infrared optical system with five lenses |
US20070183024A1 (en) * | 2006-02-03 | 2007-08-09 | John Tejada | Dual band lens system incorporating molded chalcogenide |
US20070195403A1 (en) * | 2006-02-03 | 2007-08-23 | John Tejada | Method and system for simultaneously imaging in the near infrared and short wave infrared spectrums |
US20080266442A1 (en) * | 2004-03-01 | 2008-10-30 | Sony Corporation | Imaging apparatus and arranging method for the same |
US20090084956A1 (en) * | 2003-05-28 | 2009-04-02 | Nahum Gat | External variable aperture and relay for infra-red cameras |
US20110216397A1 (en) * | 2010-03-05 | 2011-09-08 | Kouji Kawaguchi | Infrared zooming lens |
US20110216398A1 (en) * | 2010-03-05 | 2011-09-08 | Minoru Ando | Infrared zooming lens |
US8101918B1 (en) | 2009-05-13 | 2012-01-24 | Itt Manufacturing Enterprises, Inc. | Re-imaging infrared lenses |
US20120176668A1 (en) * | 2011-01-06 | 2012-07-12 | Sony Corporation | Infrared optical system and infrared imaging apparatus |
US8462418B1 (en) | 2007-06-16 | 2013-06-11 | Opto-Knowledge Systems, Inc. | Continuous variable aperture for forward looking infrared cameras based on adjustable blades |
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US9477061B2 (en) | 2011-01-20 | 2016-10-25 | Fivefocal Llc | Passively aligned imaging optics and method of manufacturing the same |
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US20050159542A1 (en) * | 2004-01-17 | 2005-07-21 | General Electric Company | Compositions useful as coatings, their preparation, and articles made therefrom |
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US7280273B2 (en) * | 2006-02-03 | 2007-10-09 | Janos Technology Inc. | Method and system for simultaneously imaging in the near infrared and short wave infrared spectrums |
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US8462418B1 (en) | 2007-06-16 | 2013-06-11 | Opto-Knowledge Systems, Inc. | Continuous variable aperture for forward looking infrared cameras based on adjustable blades |
US8101918B1 (en) | 2009-05-13 | 2012-01-24 | Itt Manufacturing Enterprises, Inc. | Re-imaging infrared lenses |
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US9007683B2 (en) * | 2011-01-20 | 2015-04-14 | Fivefocal Llc | Dual element passively athemalized infrared imaging systems |
US9448338B2 (en) | 2011-01-20 | 2016-09-20 | Fivefocal Llc | Passively athermalized infrared imaging system and method of manufacturing same |
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RU2762997C1 (en) * | 2021-07-20 | 2021-12-24 | Российская Федерация, от имени которой выступает Главное управление специальных программ Президента Российской Федерации (ГУСП) | Wide angle athermalized infrared lens with large back |
Also Published As
Publication number | Publication date |
---|---|
EP0783121B1 (en) | 2002-05-08 |
DE19600336A1 (en) | 1997-07-10 |
DE59707177D1 (en) | 2002-06-13 |
EP0783121A3 (en) | 1998-01-28 |
EP0783121A2 (en) | 1997-07-09 |
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